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Many skins are using RunAddon functions in their Home screen. The problem is, if add-on's need time to get items list RunAddon function direct you to emty list and we are seeing strange images until list parsed from internet or whatever.

Avoiding this I think using Busy Dialog on RunAddon function very good cosmetic.

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Maybe connected with this: https://github.com/xbmc/xbmc/pull/4189